People need to watch guides for dungeons now? What? Can people just not do a run on anything blind? Yeah if a farm group...know your stuff but anything else...why get a guide?
Ok...let me give some simple mentor advice:
1. When in doubt...follow the group. If you see everyone run to a specific area like they are a herd of deer who just got spooked...you need to follow them.
2. It is TOTALLY OK to be hit with a mechanic from time to time. The game is VERY good at showing you a new mechanic. They usually do it once and if you goof it then it's fine. You take a bit of damage and you carry on. When they do that mechanic again later on...NOW it usually carries a penalty like a debuff or whatever. It's telling you "Hey! I had the kids gloves on the first time...you need to watch for this." Every. Single. New mechanic is done like this. Any time a newish mechanic is done that starts off with a bang it's probably because it's a variant of a mechanic you've seen done a hundred times before but it had a slight twist. Example...a stack mechanic that hits multiple times rather than once.
3. Mistakes are ok. Just learn from them. It only gets aggravating when you refuse to learn.